The word 'stela' entered English in the late 18th century as a specialized term in archaeology and epigraphy, adopted directly from Latin. The Latin 'stela' was a borrowing of the Greek 'stēlē', which fundamentally meant an upright slab, pillar, or post. This Greek term can be traced back to the Proto-Indo-European root steh₂-, meaning "to stand," which also gives rise to a vast array of English words like 'stand,' 'static,' and 'system.' Thus, the core logic of the word, from its ancient root to its modern usage, consistently revolves around the concept of something set up or standing upright, specifically a stone monument erected for commemorative or informational purposes.

The word 'stela' is a simplex loanword from Latin, which itself borrowed it from Greek 'stēlē' (στήλη), meaning a standing block, pillar, or post. It is not productively segmented using English morphemes.